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Geological Society, London, Special Publications; 1990; v. 49; p. 419-427;
DOI: 10.1144/GSL.SP.1992.049.01.26
© 1990 Geological Society of London

Evolution of the Oman Tethyan Continental Margin

The evolution of the Oman Mountains Foreland Basin

J. Warburton1, T. J. Burnhill2, R. H. Graham2 & K. P. Isaac1

1 BP Exploration, 301 St Vincent St., Glasgow G2 5DD, UK
2 BP Petroleum Development, Britannic House, Moor Lane, Moorgate, London EC2Y 9BU, UK

The Late Cretaceous fill of the Oman Mountains foredeep is subdivided into four sub-sequences using seismic stratigraphic principles based on seismic, well and outcrop data. Sub-sequence FD-a (Late Coniacian to Early Santonian) was overriden by the Hawasina allochthon on the sea bed of the foredeep. FD-b (Early to Late Santonian) was deposited during thrusting and slices of foredeep sediment were tectonically accreted onto the allochthon during the final stages of thrusting. FD-c and FD-d (Late Santonian to Late Coniacian) were deposited after the emplacement of the allochthon into the foredeep. Subsidence curves for the foredeep area show that an emergent peripheral bulge bounded the cratonic side of the foredeep throughout the Late Cretaceous. There is no evidence that the forebulge migrated with time ahead of the advancing Hawasina thrust sheets. Instead the bulge remained in situ while the basin narrowed during thrusting. During the Maastrichtian, after infill of the foredeep, the Oman Mountains area subsided beneath sea level. Clastic supply from the drowned hinterland ceased and carbonate deposition followed. The main Oman Mountain building episode was during the Late Miocene when continent-continent collision occurred in the Zagros Mountains.





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